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Annulus: A ringlike structure, or any body part that is shaped like a ring. Applied to many small ring-shaped structures.
The base of a heart valve that supports the valve's leaflets is called the annulus. A ring-shaped pancreas that encircles the duodenum is an annular pancreas.
"Annulus" is a misspelling of the Latin "anulus" (a little ring), the diminutive of the Latin "anus" (a ring of more substantial size).
an·nu·lus (n y-l s) n. pl. an·nu·lus·es or an·nu·li (-l) 1. A ringlike figure, part, structure, or marking, such as a growth ring on the scale of a fish.
annulus /an·nu·lus/ (an´u-lus) pl. an´nuli [L.] anulus. an·nu·lus or an·u·lus (n y-l s) n. pl. an·nu·lus·es or an·nu·li (-l) A circular or ring-shaped ...
The region lying between two concentric circles. The area of the annulus formed by two circles of radii a and b (with a>b) is A_(annulus)=pi(a^2-b^2). In the above ...
Annulus: A ringlike structure, or any body part that is shaped like a ring. Applied to many small ring-shaped structures. The base of a heart valve that supports the ...
noun, plural -li , -lus·es. 1. a ring; a ringlike part, band, or space. 2. Geometry . the space between two concentric circles on a plane. 3. the veil remnant on a ...